Let MfE step back (need to power up my N950-in-use and have a look) and first get your certs done!

I gave you the hint already:
devel-su
develsh

acmcli -c common-ca -e -a myCert.pem

and Boom!

After that check again.
Please make a copy of
/var/lib/aegis/certs/common-ca
and
/et/ssl/certs
so you can diff them later.
I have no idea if cert will be added to /etc/ssl/certs, too.